I soon found that the work I was doing by someone else — in other words, I was wasting my

I soon found that the work I was doing by someone else — in other words, I was wasting my time.
A. had already been done
B. has already been done
C. would be done
D. have already been done

(答案→)A. had already been doneB. has already been doneC. would be doneD. have already been done解析：主句I soon found是一般过去时态，宾从that the work 要用过去时态的某种形式，排除B,D；且工作已经被别人做了，要用过去完成时态。I was doing是定从，修饰the work。选A。

谢谢了

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